JP2024008603A - Vehicle hood rotation structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vehicle hood rotation structure that allows an engagement portion and a restriction portion to be easily engaged with each other at the time of a front collision of a vehicle.

SOLUTION: A vehicle hood rotation structure 10 includes an arm 30, an engagement portion 33 disposed on the arm 30, and a restriction 23 portion disposed behind the engagement portion 33. The restriction portion 23 is a portion that prevents the arm 30 from being engaged with the engagement portion 33 when the arm is rotated relative to the a vehicle body 100 due to opening/closing of a hood and that is engaged with the engagement portion 33 at the time of a front collision of a vehicle to be able to restrict rearward movement of the arm 30. The arm 30 includes a degradation portion 50 disposed behind the engagement portion 33. The degradation portion 50 is deformed such that the arm 30 shrinks in a front-back direction A at the time of a front collision of the vehicle.

SELECTED DRAWING: Figure 6

COPYRIGHT: (C)2024,JPO&INPIT

Description

The present invention relates to a hood rotating structure for a vehicle.

A vehicle hood rotating structure includes an arm, an engaging portion, and a restricting portion. A vehicle hood is fixed to the arm. The arm is rotatable relative to the vehicle body. The engaging portion is provided on the arm.

The restricting portion is arranged forward of the engaging portion. The restricting portion is prevented from engaging with the engaging portion when the arm rotates relative to the vehicle body due to opening and closing of the hood. The restricting portion is engaged with the engaging portion during a frontal collision of the vehicle. The engaging portion and the restricting portion are engaged with each other during a frontal collision of the vehicle, thereby restricting rearward movement of the arm.

In the vehicle hood rotation structure described in Patent Document 1, when a vehicle is involved in a frontal collision, the hood is moved rearward and the vehicle rear end of the hood is moved upward. Accordingly, the arm is moved rearward and rotated upward, so that the engaging portion and the restricting portion are engaged with each other. This prevents the hood from breaking the windshield glass of the vehicle and entering the vehicle interior.

Japanese Patent Application Publication No. 2007-290498

Incidentally, there is a need to make it easier to engage the engaging portion and the restricting portion in the event of a frontal collision of the vehicle.

A vehicle hood rotation structure that solves the above problems includes a vehicle hood fixed, an arm rotatable with respect to the vehicle body, an engaging portion provided on the arm, and the engaging portion. This is a restricting part disposed rearward than the hood, and is a part that avoids engagement with the engaging part when the arm rotates with respect to the vehicle body by opening and closing the hood, and A hood rotation structure for a vehicle, comprising: a restriction part that is capable of restricting rearward movement of the arm by being engaged with the engaging part in the event of a frontal collision, wherein the arm is engaged with the engaging part. The vehicle has a retractable portion disposed rearward than the retractable portion, and the retractable portion deforms so that the arm retracts in the longitudinal direction of the vehicle when the vehicle is in a frontal collision.

According to the above configuration, when the arm retracts in the longitudinal direction of the vehicle due to deformation of the retractable portion due to a frontal collision of the vehicle, the engaging portion approaches the restricting portion and the engaging portion is engaged with the restricting portion. It becomes easier. Therefore, it becomes easier to engage the engaging portion and the restricting portion in the event of a frontal collision of the vehicle.

In the vehicle hood rotating structure described above, the arm protrudes from a plate portion having a thickness in the vehicle width direction of the vehicle and one of a pair of side surfaces of the plate portion located in the vehicle width direction. At the same time, it has a bead arranged rearward than the engaging part, and the retracted part is preferably a part of the plate part where the bead is provided.

According to the above configuration, the rigidity of the portion of the plate portion where the bead is provided is higher than the rigidity of the portion of the plate portion located on the opposite side from the bead. In the event of a frontal collision of a vehicle, the plate portion bends with the portion of the plate portion where the bead is provided as a peak and the portion of the plate portion located on the opposite side of the bead as a valley. That is, a portion where the rigidity of the plate portion changes in the thickness direction is formed by a bead. Therefore, the arm easily deforms so as to contract in the longitudinal direction of the vehicle at the position of the retractable portion. Therefore, deformation in which the arm contracts in the longitudinal direction of the vehicle by the retracting portion can be suitably realized. Therefore, engagement between the engaging portion and the restricting portion can be suitably realized at the time of a frontal collision of the vehicle.

In the vehicle hood rotating structure described above, the arm has a plate portion having a thickness in the vehicle width direction of the vehicle, and the arm has a plate portion disposed rearwardly than the engaging portion. Preferably, a through hole passing through the plate portion in the thickness direction is formed, and the retracted portion is a portion of the plate portion where the through hole is formed.

According to the above configuration, the rigidity of the retracted portion of the plate portion is smaller than the rigidity of the portion of the plate portion where the through hole is not provided. Therefore, the portion of the plate portion where the through hole is formed is likely to bend in the vehicle width direction. That is, by forming a portion in the plate portion where the rigidity is reduced due to the through hole, the arm is easily deformed so as to contract in the longitudinal direction of the vehicle at the position of the retraction portion. Deformation in which the arm contracts in the longitudinal direction of the vehicle can be suitably realized by the retracting portion. Therefore, engagement between the engaging portion and the restricting portion can be suitably realized at the time of a frontal collision of the vehicle.

In the vehicle hood rotating structure described above, the arm includes a plate portion having a thickness in the vehicle width direction of the vehicle, and a plate portion extending from an upper edge of the plate portion in the thickness direction of the plate portion, to which the hood is fixed. a flange portion, and a portion of the flange portion located rearward than the engaging portion includes a first portion and a second portion, and the first portion is located opposite to the second portion. The amount of protrusion of the first portion from the plate portion is smaller than the amount of protrusion of the second portion from the plate portion, and the retracted portion is located behind the first portion and the second portion from the plate portion. It is preferable that the first portion of the plate portion is formed by a continuous portion.

According to the above configuration, the rigidity of the retracted portion of the arm is smaller than the rigidity of the second portion of the flange portion and the portion of the plate portion that is continuous with the second portion. That is, the arm is likely to deform so as to contract in the longitudinal direction of the vehicle at the position of the retractable portion. Therefore, deformation in which the arm contracts in the longitudinal direction of the vehicle by the retracting portion can be suitably realized. Therefore, engagement between the engaging portion and the restricting portion can be suitably realized at the time of a frontal collision of the vehicle.

FIG. 2 is a side view of the vehicle. FIG. 2 is a perspective view of a vehicle hood rotation structure. FIG. 2 is a side view of the hood rotation structure of the vehicle. FIG. 1 is a top view of a first embodiment of a vehicle hood rotation structure. It is a side view of a 1st embodiment. FIG. 7 is a top view showing a modification of the retraction portion of the first embodiment. It is a side view of 2nd Embodiment of the hood rotation structure of a vehicle. It is a top view of 3rd Embodiment of the hood rotation structure of a vehicle.

[First embodiment]
A first embodiment of a vehicle hood rotating structure will be described below with reference to FIGS. 1 to 6. In the following description, the longitudinal direction of the vehicle will be referred to as the longitudinal direction A. The left and right direction of the vehicle is defined as the vehicle width direction B. Let the vertical direction of the vehicle be the vertical direction C.

<Vehicle hood rotation structure>
As shown in FIG. 1, the vehicle hood rotating structure 10 is a structure in which a hood 101 that opens and closes the front upper surface of the vehicle body 100 is supported on the vehicle body 100. The hood 101 is arranged in front of and below the windshield glass 102. The vehicle hood rotating structure 10 is provided between the front upper surface of the vehicle body 100 and the windshield glass 102 in the longitudinal direction A, as shown by the circle indicated by the two-dot chain line in FIG. Although not shown, two vehicle hood rotation structures 10 are employed for the vehicle body 100. Each of the vehicle hood rotation structures 10 is arranged at intervals in the vehicle width direction B. The detailed configuration of the vehicle hood rotation structure 10 will be described below, but for convenience of explanation, only one vehicle hood rotation structure 10 is illustrated in FIGS. 2 to 6. Note that the positions of the hood 101 shown in FIGS. 2 to 6 indicate the positions of the hood 101 in a state where the hood 101 covers the upper front surface of the vehicle body 100.

As shown in FIGS. 2 and 3, the vehicle hood rotation structure 10 includes a base 20, an arm 30, and a rotating shaft 40.
<Base>
The base 20 has a fixed plate 21 and a support plate 22. The fixed plate 21 is fixed to the vehicle body 100. The fixed plate 21 is fixed, for example, to the upper part of the wheel apron upper member 100a of the vehicle body 100. Therefore, the base 20 is fixed to the vehicle body 100. The support plate 22 extends upward from the fixed plate 21. The support plate 22 has a thickness in the vehicle width direction B.

The support plate 22 has a restriction portion 23 . The restriction portion 23 is provided at the front end of the support plate 22 . The restricting portion 23 projects further forward than the fixing plate 21 . The restriction portion 23 has a stopper portion 23a. The stopper portion 23a is formed by partially protruding the front end of the restriction portion 23 forward.

<Arm>
The arm 30 is provided inside the base 20 in the vehicle width direction B. The arm 30 has a plate portion 31 and a flange portion 32. The plate portion 31 has a thickness in the vehicle width direction B. The thickness of the plate portion 31 in the vehicle width direction B is uniform. In a state where the hood 101 covers the front upper surface of the vehicle body 100, the dimension of the plate portion 31 in the longitudinal direction A is longer than the dimension of the base 20 in the longitudinal direction A.

A rear end portion of the plate portion 31 is supported by a rear end portion of the base 20 via a rotating shaft 40. Since the plate portion 31 is supported by the base 20 via the rotating shaft 40, the arm 30 is rotatable with respect to the base 20. Since the base 20 is fixed to the vehicle body 100, the arm 30 is rotatable relative to the vehicle body 100.

The plate portion 31 has a first edge 31a and a second edge 31b. In a state where the hood 101 covers the front upper surface of the vehicle body 100, the first edge 31a is the upper edge of the plate portion 31. In a state where the hood 101 covers the front upper surface of the vehicle body 100, the second edge 31b is the lower edge of the plate portion 31.

The plate portion 31 has a pair of side surfaces 31c. The pair of side surfaces 31c are surfaces located in the thickness direction of the plate portion 31. The pair of side surfaces 31c are surfaces of the plate portion 31 located in the vehicle width direction B. One of the pair of side surfaces 31c is a first surface 31d, and the remaining one is a second surface 31e. The first surface 31d is a surface of the plate portion 31 located on the inside in the vehicle width direction B. The second surface 31e is a surface of the plate portion 31 located on the outside in the vehicle width direction B.

The flange portion 32 extends in the thickness direction of the plate portion 31 from the first end edge 31a. The flange portion 32 extends inward in the vehicle width direction B from the plate portion 31. A rear end portion of the hood 101 is fixed to the flange portion 32. A hood 101 is fixed to the arm 30.

The plate portion 31 has an engaging portion 33. That is, the vehicle hood rotating structure 10 includes an engaging portion 33 provided on the arm 30. The engaging portion 33 is plate-shaped. The engaging portion 33 extends from the plate portion 31 in the thickness direction of the plate portion 31. The engaging portion 33 extends outward in the vehicle width direction B from the second end edge 31b of the plate portion 31.

The engaging portion 33 includes a protruding plate 33a and a stretching plate 33b. The protruding plate 33a extends in the thickness direction of the plate portion 31 from the second end edge 31b. The extending plate 33b protrudes rearward from the tip of the protruding plate 33a. The stretching plate 33b is located on the outer side of the restricting portion 23 in the vehicle width direction B. In a state where the hood 101 covers the front upper surface of the vehicle body 100, the protruding plate 33a is located forward of the restricting portion 23. In a state where the hood 101 covers the front upper surface of the vehicle body 100, the restricting portion 23 is disposed further rearward than the engaging portion 33. In a state where the hood 101 covers the front upper surface of the vehicle body 100, the protruding plate 33a is located below the stopper portion 23a of the restriction portion 23.

<Degenerate part>
As shown in FIGS. 4 and 5, the arm 30 has a bead 60. As shown in FIGS. The bead 60 protrudes from the first surface 31d of the plate portion 31 in the thickness direction of the plate portion 31. In a state where the hood 101 covers the front upper surface of the vehicle body 100, the bead 60 is disposed further rearward than the engaging portion 33. The bead 60 extends to connect the first edge 31a and the second edge 31b of the plate portion 31. In a state where the hood 101 covers the front upper surface of the vehicle body 100, the bead 60 is provided in a predetermined range in the front-rear direction A on the first surface 31d of the plate portion 31. The portion of the plate portion 31 where the bead 60 is provided is the retracted portion 50 . The arm 30 has a retracted portion 50. The retraction portion 50 is disposed at the rear of the engagement portion 33 in the arm 30.

<Restricting part and engaging part>
As shown in FIG. 3, in the vehicle hood rotation structure 10, a case is assumed in which the arm 30 is rotated with respect to the vehicle body 100 for the purpose of opening and closing the front upper surface of the vehicle body 100 with the hood 101. In this case, engagement between the protruding plate 33a of the engaging portion 33 and the stopper portion 23a of the limiting portion 23 is avoided. That is, when the arm 30 is rotated about the rotation axis 40, the rotation locus R of the rear end of the protrusion plate 33a passes in front of the stopper part 23a of the restriction part 23. The vehicle hood rotation structure 10 has a restriction portion 23 that is a portion where engagement with the engagement portion 33 is avoided when the arm 30 rotates relative to the vehicle body 100 by opening and closing the hood 101.

Further, assume that the vehicle is involved in a frontal collision while the hood 101 covers the front upper surface of the vehicle body 100. In this case, the rear end portion of the hood 101 is moved upward while the hood 101 is moved backward, and the arm 30 is rotated upward while being moved backward relative to the base 20.

Then, as shown in FIG. 6, the plate part 31 is bent with the part of the plate part 31 where the bead 60 is provided as a peak and the part of the plate part 31 located on the opposite side of the bead 60 as a valley. Therefore, the retraction portion 50 deforms so that the arm 30 retracts in the longitudinal direction A during a frontal collision of the vehicle.

Then, as the protruding plate 33a of the engaging part 33 of the arm 30 approaches the restricting part 23, the stopper part 23a of the restricting part 23 is arranged above the protruding plate 33a. Then, the protruding plate 33a of the engaging portion 33 contacts the restricting portion 23 in the front-rear direction A, thereby restricting the rearward movement of the arm 30. Further, even if the arm 30 attempts to rotate upward, the stopper portion 23a of the restricting portion 23 and the protruding plate 33a of the engaging portion 33 are engaged with each other. Therefore, the rotation of the arm 30 is also limited. The hood rotation structure 10 for a vehicle includes a restriction portion 23 that can restrict rearward movement of the arm 30 by being engaged with an engaging portion 33 at the time of a frontal collision of the vehicle.

The engagement between the restricting part 23 and the engaging part 33 restricts the upward rotation of the arm 30 with respect to the base 20, so that, for example, as indicated by the dashed line in FIG. The center part of the center part becomes easier to bend upward. Specifically, the hood 101 is easily bent into a dogleg shape. Therefore, the rear end of the hood 101 is prevented from breaking the windshield glass 102 and entering the vehicle interior.

[Actions and effects of this embodiment]
The operation and effects of this embodiment will be explained.
(1-1) When the arm 30 contracts in the longitudinal direction A due to deformation of the retractable portion 50 due to a frontal collision of the vehicle, the engaging portion 33 approaches the restricting portion 23 , and the engaging portion 33 approaches the restricting portion 23 . becomes more likely to be engaged. Therefore, it becomes easier to engage the engaging portion 33 and the restricting portion 23 in the event of a frontal collision of the vehicle.

(1-2) The rigidity of the portion of the plate portion 31 where the bead 60 is provided is higher than the rigidity of the portion of the plate portion 31 located on the opposite side from the bead 60. At the time of a frontal collision of the vehicle, the plate part 31 bends with the part of the plate part 31 where the bead 60 is provided as a peak and the part of the plate part 31 located on the opposite side of the bead 60 as a valley. That is, the bead 60 forms a portion where the rigidity of the plate portion 31 changes in the thickness direction. Therefore, the arm 30 is easily deformed so as to contract in the front-rear direction A at the position of the retractable portion 50. Therefore, the deformation in which the arm 30 is contracted in the front-rear direction A by the retracting portion 50 can be suitably realized. Therefore, engagement between the engaging portion 33 and the restricting portion 23 can be suitably realized at the time of a frontal collision of the vehicle.

(1-3) When the hood 101 covers the front upper surface of the vehicle body 100, the larger the distance between the flange portion 32 and the rotating shaft 40 in the vertical direction C, the more the hood 101 rotates upward in the event of a frontal collision of the vehicle. It becomes easier to move. Therefore, it becomes difficult for the engaging portion 33 and the restricting portion 23 to engage with each other.

In this regard, in this embodiment, the arm 30 has a retracted portion 50. Therefore, in a state where the hood 101 covers the front upper surface of the vehicle body 100, even if the distance between the flange portion 32 and the rotating shaft 40 in the vertical direction C is large, the engaging portion 33 and the restricting portion 23 cannot be connected to each other. More reliable engagement can be achieved.

[Second embodiment]
A second embodiment of a vehicle hood rotating structure will be described below with reference to FIG. Note that detailed description of the same configuration as in the first embodiment will be omitted. Note that the position of the hood 101 shown in FIG. 7 indicates the position of the hood 101 when the hood 101 covers the upper front surface of the vehicle body 100.

<Degenerate part>
As shown in FIG. 7, the arm 30 has a through hole 70 formed therein. The through hole 70 penetrates the plate portion 31 in the thickness direction. In a state where the hood 101 covers the front upper surface of the vehicle body 100, the through hole 70 is disposed further rearward than the engaging portion 33. The portion of the plate portion 31 in which the through hole 70 is formed is the retracted portion 50 .

[Operation of this embodiment]
The operation of this embodiment will be explained.
In this embodiment, the rigidity of the retracted portion 50 in the plate portion 31 is smaller than the rigidity of a portion of the plate portion 31 where the through hole 70 is not provided. Therefore, the portion of the plate portion 31 where the through hole 70 is formed is likely to bend in the vehicle width direction B. That is, by forming a portion in the plate portion 31 where the rigidity is reduced due to the through hole 70, the arm 30 is easily deformed so as to contract in the front-rear direction A at the position of the retraction portion 50.

[Effects of this embodiment]
In addition to the effects (1-1) and (1-3) of the first embodiment, the present embodiment provides the following effects.

(2-1) When an impact is applied to the arm 30 from the front during a frontal collision of the vehicle, the portion of the plate portion 31 where the through hole 70 is formed is likely to bend in the vehicle width direction B. Therefore, the deformation in which the arm 30 is contracted in the front-rear direction A by the retracting portion 50 can be suitably realized. Therefore, engagement between the engaging portion 33 and the restricting portion 23 can be suitably realized at the time of a frontal collision of the vehicle.

[Third embodiment]
A third embodiment of a vehicle hood rotation structure will be described below with reference to FIG. 8. Note that detailed description of the same configuration as in the first embodiment will be omitted. The position of the hood 101 shown in FIG. 8 shows the position of the hood 101 when the hood 101 covers the upper front surface of the vehicle body 100.

<Degenerate part>
As shown in FIG. 8, when the hood 101 covers the front upper surface of the vehicle body 100, the flange portion 32 extends in the front-rear direction A to the rear of the engagement portion 33. The portion of the flange portion 32 located rearward of the engaging portion 33 includes a first portion 32a and a second portion 32b. The first portion 32a is located further back than the second portion 32b. A protrusion amount W1 of the first portion 32a from the plate portion 31 is smaller than a protrusion amount W2 of the second portion 32b from the plate portion 31. A retracted portion 50 is formed by a continuous portion of the first portion 32a of the plate portion 31 and the first portion 32a.

[Operation of this embodiment]
The operation of this embodiment will be explained.
In this embodiment, the rigidity of the retractable portion 50 in the arm 30 is smaller than the rigidity of the second portion 32b of the flange portion 32 and the portion of the plate portion 31 that is continuous with the second portion 32b. That is, the arm 30 easily deforms so as to contract in the front-rear direction A at the position of the retractable portion 50.

[Effects of this embodiment]
In addition to the effects (1-1) and (1-3) of the first embodiment, the present embodiment provides the following effects.

(3-1) When an impact is applied to the arm 30 from the front during a frontal collision of the vehicle, the arm 30 is likely to bend in the vehicle width direction B at the position of the retraction portion 50. Therefore, the deformation in which the arm 30 is contracted in the front-rear direction A by the retracting portion 50 can be suitably realized. Therefore, engagement between the engaging portion 33 and the restricting portion 23 can be suitably realized at the time of a frontal collision of the vehicle.

[Example of change]
Note that each of the above embodiments can be modified and implemented as follows. The above embodiments and the following modified examples can be implemented in combination with each other within a technically consistent range.

- In the third embodiment, the flange portion 32 may have a third portion in addition to the first portion 32a and the second portion 32b. The amount of protrusion of the third portion from the plate portion 31 may be greater than the amount of protrusion W1 of the first portion 32a from the plate portion 31. The portion of the flange portion 32 located rearward of the engaging portion 33 may include the first portion 32a and the second portion 32b.

- In the third embodiment, the portion of the flange portion 32 located rearward of the engaging portion 33 may be formed only of the first portion 32a or the second portion 32b. In this case, the degeneration unit 50 described in the first embodiment or the degeneration unit 50 described in the second embodiment may be employed.

- In the second embodiment, instead of the through hole 70, a cutout section obtained by cutting out a part of the first end edge 31a or a part of the second end edge 31b of the plate part 31 may be adopted. . The portion of the plate portion 31 in which the notch portion is formed may be used as the retracted portion 50. In short, it is sufficient if the part of the plate part 31 where the rigidity is reduced can be made into the retracted part 50.

- In the first embodiment, the bead 60 may be provided on the second surface 31e instead of the first surface 31d. In short, it is only necessary to form a portion of the plate portion 31 whose rigidity changes due to the bead 60.

- In the first embodiment, the bead 60 may be omitted and a groove recessed toward the first surface 31d may be provided on the second surface 31e of the plate portion 31. Further, a portion of the plate portion 31 where the groove is provided may be used as the retracted portion 50. In short, it is only necessary to form a part in the plate part 31 where the rigidity of the plate part 31 changes in the thickness direction by the groove. Note that the groove of this modification may be provided on the first surface 31d of the plate portion 31.

- In each of the above embodiments, the plate portion 31 of the arm 30 has a thickness in the vehicle width direction B. Therefore, in the event of a frontal collision of the vehicle, the arm 30 is likely to bend in the vehicle width direction B at the position of the retraction portion 50. However, for example, the arm 30 may be modified so that the plate portion 31 has a thickness in the vertical direction C so that it is bent in the vertical direction C in the event of a frontal collision of the vehicle. It is preferable that the part of the arm 30 that is the starting point of bending in the vertical direction C be the retracted part 50 . The configuration of the degeneration unit 50 may be different from the configuration of the degeneration unit 50 in each of the embodiments described above. In short, the retracting portion 50 may have any configuration as long as it can deform so that the arm 30 retracts in the longitudinal direction A during a frontal collision of the vehicle.

- In each of the above embodiments, the restricting portion 23 is provided on the base 20, but the present invention is not limited thereto. For example, the restriction portion 23 may be integrally formed with the vehicle body 100. For example, the restricting portion 23 may be made to protrude from the upper part of the wheel apron upper member 100a. The restricting portion 23 only needs to be able to engage with the engaging portion 33 during a frontal collision of the vehicle, and its arrangement and shape are not limited.

- In each of the above embodiments, the engaging portion 33 may be formed only of the protruding plate 33a, omitting the stretching plate 33b.
- In each of the above embodiments, the base 20 is fixed to the wheel apron upper member 100a, but the base 20 is not limited to this. As long as the base 20 can be fixed to the vehicle body 100, the location where the base 20 is fixed may be changed as appropriate.

- In each of the above embodiments, the base 20 may be omitted from the vehicle hood rotation structure 10. In this case, the arm 30 is preferably rotatably attached to a mounting plate portion integrally formed on the upper portion of the wheel apron upper member 100a, for example. In short, the arm 30 only needs to be rotatable relative to the vehicle body 100. Note that the location where the above mounting plate portion is integrally formed is not limited to the wheel apron upper member 100a. The above mounting plate portion may be integrally formed at any location on the vehicle body 100.

DESCRIPTION OF SYMBOLS 10... Vehicle hood rotation structure, 23... Restriction part, 30... Arm, 31... Plate part, 31a... First edge as the upper end edge of plate part 31, 31c... Pair of side surfaces in plate part, 31d... Pair 32...flange part, 32a... first part, 32b... second part, 33... engaging part, 50... retraction part, 60... bead, 70... through hole, 100... Vehicle body, 101... Hood, A... Front-rear direction, B... Vehicle width direction, W1... Amount of protrusion of the first portion from the plate portion, W2... Amount of protrusion of the second portion from the plate portion.

Claims (4)

An arm to which the hood of the vehicle is fixed and rotatable relative to the vehicle body;
an engaging portion provided on the arm;
A restriction portion disposed rearward of the engaging portion, which is a portion that avoids engagement with the engaging portion when the arm rotates with respect to the vehicle body due to opening and closing of the hood. A hood rotation structure for a vehicle, comprising: a restriction portion that is capable of restricting rearward movement of the arm by being engaged with the engagement portion during a frontal collision of the vehicle,
The arm has a retractable part located rearward than the engaging part,
The hood rotation structure for a vehicle, wherein the retracting portion deforms so that the arm retracts in the longitudinal direction of the vehicle when the vehicle is in a frontal collision. The arm is
a plate portion having a thickness in the vehicle width direction of the vehicle;
a bead that protrudes from one of a pair of side surfaces of the plate portion located in the vehicle width direction and is located rearward of the engaging portion;
The vehicle hood rotating structure according to claim 1, wherein the retracted portion is a portion of the plate portion where the bead is provided. The arm has a plate portion having a thickness in the vehicle width direction of the vehicle,
A through hole is formed in the arm, the through hole being disposed behind the engaging portion and penetrating the plate portion in the thickness direction;
The vehicle hood rotating structure according to claim 1, wherein the retracted portion is a portion of the plate portion where the through hole is formed. The arm is
a plate portion having a thickness in the vehicle width direction of the vehicle;
a flange portion extending from the upper end edge of the plate portion in the thickness direction of the plate portion and to which the hood is fixed;
A portion of the flange portion located behind the engaging portion includes a first portion and a second portion,
The first part is located further back than the second part,
The amount of protrusion of the first portion from the plate portion is smaller than the amount of protrusion of the second portion from the plate portion,
The hood rotation structure for a vehicle according to claim 1, wherein the retracted portion is formed by a portion of the first portion and the first portion of the plate portion that are continuous.

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